<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 添加角色按钮区域 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>

            <!-- 角色列表区域 -->
            <el-table :data="rolelist" border stripe>
              <!-- 展开列 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
                   v-for="(item1,i1) in scope.row.children" :key="item1.id">
                    <!-- 渲染一级权限 -->
                    <el-col :span="5">
                      <el-tag closable @close="closeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                      <i class="el-icon-caret-right"></i>
                    </el-col>
                    <!-- 渲染二级和三级权限 -->
                    <el-col :span="19">
                      <!-- 通过 for 循环 嵌套渲染二级权限 -->
                      <el-row :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                        <el-col :span="6">
                          <el-tag closable @close="closeRightById(scope.row, item2.id)" type="success">{{item2.authName}}</el-tag>
                          <i class="el-icon-caret-right"></i>
                        </el-col>
                        <el-col :span="18">
                            <el-tag type="warning" v-for="(item3) in item2.children"
                             :key="item3.id" closable @close="closeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                        </el-col>
                      </el-row>
                    </el-col>
                  </el-row>
                </template>
              </el-table-column>
              <!-- 索引列` -->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="角色" prop="roleName"></el-table-column>
              <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
              <el-table-column label="操作" width="330px">
                <template slot-scope="scope">{{scope.row.id}}
                  <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                  <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                  <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                </template>
              </el-table-column>
            </el-table>
        </el-card>

        <!-- 分配权限的对话框 -->
        <el-dialog
          title="分配权限"
          :visible.sync="setRightDialogVisible"
          width="50%" @close="setRightDialogClosed">
          <!-- 树形控件 -->
          <el-tree :data="rightslist" :props="treeProps" show-checkbox
          node-key="id" default-expand-all :default-checked-keys="defKeys"
          ref="treeRef"></el-tree>
          <span slot="footer" class="dialog-footer">
            <el-button @click="setRightDialogVisible = false">取 消</el-button>
            <el-button type="primary"
             @click="allotRights">确 定</el-button>
          </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有角色列表数据
      rolelist: [],
      // 控制分配去哪先对话框的显示与隐藏
      setRightDialogVisible: false,
      // 所有权限的数据
      rightslist: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点ID值数组
      defKeys: [],
      // 当前即将分配权限的角色ID
      roleId: ''
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    //   获取所有角色的列表
    async getRolesList() {
      const { data: res } = await this.$http.get('/roles')

      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }

      this.rolelist = res.data
      console.log(this.rolelist)
    },
    // 根据ID删除对应的权限
    async closeRightById(role, rightId) {
      // 弹框提示用户是否要删除
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除')
      }

      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败')
      }

      // this.getRolesList()
      role.children = res.data
    },
    async showSetRightDialog(role) {
      this.roleId = role.id
      // 获取所有权限的数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败')
      }

      // 把获取到的权限数据保存到 data 中
      this.rightslist = res.data
      console.log(this.rightslist)

      // 递归获取三级节点的ID
      this.getLeafKeys(role, this.defKeys)

      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下所有三级权限的ID，并保存到 defKeys 数组中
    getLeafKeys(node, arr) {
      // 如果当前 node 节点不包含 children 属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }

      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      })
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed() {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]

      const idStr = keys.join(',')

      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, {
        rids: idStr
      })

      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }

      this.$message.success('分配权限成功！')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>
